Light indicator on Xiaomi Redmi Note 9 Pro does not work: 7 reasons and how to fix

Light indicator (LED-Notification indicator on Xiaomi Redmi Note 9 Pro is a small but important element that signals missed calls, messages or low battery power. When it suddenly stops working, it is not only annoying, but also deprives the user of visual cues. In 80% of cases, the problem is solved software, but sometimes hardware malfunctions are to blame - from oxidized contacts to damaged chips.

In this article, we'll look at all the possible reasons why the indicator stopped flashing or glowing, from the banal settings of MIUI to serious failures of the board. You'll learn how to check the performance of the LED yourself, what parameters in the system are responsible for its operation, and when to contact the service center. And if you have already tried to restart your smartphone or reset, but nothing has worked - at the end of this article there is a unique way of diagnosis through the engineering menu, which few people know.

1. Check the basic settings of MIUI

The first thing you need to do is make sure that the light indicator is not turned off in the system settings. In MIUI 12/13/14, the path to this parameter may differ, but the general logic remains.

Settings → Notifications and Status String → Notification Indicator

If this item is missing, your firmware version is hiding it. Then try an alternative way:

Settings → Additional → Special features → Notification indicator

• 🔹 Is the indicator on? Check the slider at the top of the screen. Sometimes it resets after the update. MIUI.
• 🔹 Colors and events: Make sure that the right types of notifications (calls) are available, SMS, Messengers are assigned a color, for example, by default, calls can be tied to red, and messages can be tied to blue.
• 🔹 Brightness. Some firmware has a brightness adjustment, and if it's kept to a minimum, the glow can be invisible in bright light.

⚠️ Note: On the Redmi Note 9 Pro with custom firmware (such as LineageOS or Pixel Experience), the path to indicator settings may be radically different.

2. Software failures: from cache to firmware

If the settings are fine, but the indicator still doesn't blink, the problem can be system failures, starting with the most innocuous one: cleaning the cache of the applications responsible for notifications.

Go to Settings → Applications → Application Management and find:

• 📱 "Notifications” (or Notification Manager)
• 📱 "System settings” (Settings)
• 📱 "MIUI System" (if any)

For each of them, click Warehouse → Clear the cache. Afterwards, restart the phone.

If that doesn't work, the next step is to reset the notification settings.

1. Open Settings → Applications → Permissions.
2. Slip on the three dots in the top right corner and select Reset notification settings.
3. Confirm the action and restart the device.

⚠️ Warning: Once reset, all of the individual app notification settings (sounds, vibrations, priorities) will return to factory settings.

If the problem has occurred after the MIUI update, try rolling back to the previous version via Settings → About Phone → System Update → Three Points → Select an update pack. To do this, you need to pre-download the full firmware file (for example, from the Xiaomi Firmware Updater site).

3. Application conflicts and safe mode

The light indicator may not work due to conflict with third-party apps, especially if they have access to notifications or system permissions. To check this, run the phone in Safe Mode:

1. Press the power button before the off menu appears.
2. Press the “Switch off” (or “Switch off”) item before a request to switch to safe mode appears.
3. Confirm and wait for the reboot.

Only system applications are running in Safe Mode, check if the indicator flashes when you receive a notification (e.g., call your phone from another device), if so, a problem in one of the installed applications.

To find the culprit:

1. Get back to normal.
2. Remove recently installed applications (especially optimizers, launchers, or notification management programs).
3. If it does not help, sort the applications by installation date and delete them alternately, checking the indicator.

Pay particular attention to:

• 🛡️ Antiviruses (e.g. Avast, 360 Security)
• 🔄 Optimizers (Clean Master, DU Speed Booster)
• 🔔 Notifications Management (Light Manager, Notification History)

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If the indicator is in safe mode, but not in normal mode, check their permissions in Settings → Apps → Permissions → Notifications before uninstalling applications.

Hardware malfunctions: from contacts to chips

If the software methods didn't work, the problem is probably hardware. On the Redmi Note 9 Pro, the light indicator is located next to the front camera and connected to the motherboard through a flexible plume.

The most common hardware problem is contact oxidation, and if the phone fell, got moisture, or was in a wet room for a long time, the contacts could be covered with oxide film, in which case the indicator either doesn't work at all, or it flashes intermittently.

For self-diagnosis:

1. Turn off the phone and remove it. SIM-memory-card.
2. Carefully slap the back cover (need a mediator or plastic shoulder blade).
3. Check the contacts of the indicator on the board - they are located next to the battery connector.
4. If you see green or white, it's oxidation, and you can clean it with alcohol and a soft brush.

⚠️ Attention: Disassembling a phone without experience can damage the plumes or board. If you are not sure, you should contact the service. On the Redmi Note 9 Pro, the display plume is very fragile and easily breaks when handled carelessly.

5. Diagnostics through the engineering menu (hidden function)

Few people know, but Xiaomi has a hidden engineering menu through which you can test the light indicator regardless of the system, which will help you understand whether the problem is in the hardware or firmware.

To get on the menu:

1. Open the Phone app.
2. Enter the combination: ##36446337## (or #3644637## for some versions of MIUI).
3. Select the Hardware Testing option → LED.

In the menu you will see options for testing the indicator:

• 🔴 Red LED — red-coloured
• 🔵 Green LED — green-test
• 🔷 Blue LED — blue-test
• ⚪ White LED — white color test (if supported)

If you press the colors, the indicator doesn't light up, it's 100% hardware (diode, plume, or chip damage) and if it lights up, it's the firmware or MIUI settings that are to blame.

💡

Testing through the engineering menu is the only way to distinguish a software failure from a hardware breakdown without disassembling the phone.

6. When to contact the service center?

If you’ve tried all the methods in this article, but the indicator still doesn’t work, it’s time to contact a specialist.

• 🔧 The indicator does not respond to tests in the engineering menu.
• 🔧Together with the indicator stopped working front camera or proximity sensor.
• 🔧 On the board, traces of oxidation, swollen capacitors or burned tracks are visible.
• 🔧 The phone fell from a height or was exposed to moisture.

The cost of repair depends on the reason:

Before the service visit:

1. Make a backup copy of the data (in case of a reset or replacement fee).
2. Write down the phone’s IMEI (on the box or in Settings → About the phone).
3. Check whether you have a warranty for repairs (at least 3 months).

⚠️ Note: Unofficial services may offer “cheap” repairs using used parts, which can cause repeated breakdowns. Xiaomi’s official service centers guarantee original components, but repairs there are more expensive.

7. Alternative methods of receiving notifications

While the indicator is not repaired, you can configure alternative alert methods to avoid missing important notifications:

• 🔔 Screen notifications. Enable notifications on the locked screen: Settings → Screen locking → Notifications on the lock screen.
• 🎵 Set up unique tunes for different types of notifications in Settings → Sounds and vibrations.
• 📳 Vibration. Turn on vibration response: Settings → Special facilities → Vibration on touch.
• 💡 Always-on Display (AOD). If your model supports, include in the Settings → Display. → Always-on Display.

For advanced users, there are replacement apps for the indicator, for example:

• Light Manager – allows you to adjust the colors and frequency of blinking.
• Notification Light emulates a light indicator through the screen.
• LED Blinker Notifications – supports custom colors and animations.

Note that these applications consume extra battery power as they are forced to keep the screen or processor active.

FAQ: Frequent questions about light indicator